Paper-pulp digester



(No Mod eL) O. BREMAKER,v

PAPER PULP DIGBSTER7 f No. 373,810. Patented Nov. '29 1887.

INVENTOR. fi/JX/VMJZAA g $2 M MIA/KL? UNITED STATES PATENT @EErcE.

CHARLES BREMAKER, OF LOUISVILLE, KENTUCKY.

PAPER-PULP D'IGESTER.

SPECIFICATION forming part of Letters Patent No. 373,810, dated November 29, 1887.

Application filed September 22,1886. Serial No.2l4,272. (No model.)

To all whom, it may concern:

Be it known that I, CHARLES BREMAKER, acitizen of the United States, residing at Louisville, in the county of Jefferson and State of Kentucky, have invented a certain new and useful Improvement in Paper-Pulp Digesters; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings,forming part of this specification.

This my invention relates to certain new and useful improvements in paper-pul p digesters, consisting in a digester the shell of which is made in sections of any required number securely riveted together, with rings of metal between the parts, placed about one inch (more or less) below the top end of the shell-sheets, and of sufficient thickness to form a recess for the end of the lead lining to drop into and support the weight of the lead lining, and by its peculiar construction holds it in place, thereby preventing the lead lining from collapsing. The space between the lead sheets is filled with melted lead and the sheets burned securely together; or melted solder may be used for uniting the sheets, and also in the manner of securing the bottom to the digester and the uniting of the lead lining of the bottom and sides at the corners, the bottom of the digester being secured to the lower end of the sheet by means of a strong metal flange on the end to which it is bolted. The interior of the bottom is covered with sheet-lead, disconnected at the corners, with the edge turned up to form a recess to admit the lower end of the side lining to pass down behind it, with sufficient space between the parts to give room for burning or soldering to unite the sheets securely and form a strong steam-tight joint at that point.

The object of this myinvention is to provide a paper-pulp digester that will stand the action of the acid liquor and not be liable to leak through the lead lining and damage the iron shell, thereby causing much trouble and loss of time and money in making repairs.

I attain the above object by the mechanism illustrated in the drawings, in which- Figure l is a sectional view of the digester, showing the several improvements thereon.

Fig. 2 is a sectional View of the flange-ring bolts, showing the lead bushing around the bolt.

Similar letters refer to similar parts throughout the several views.

In the drawings, A represents the digester, which is made in sections in form as shown in the drawings, with the sections B B secured together by means of rivets, with a metal ring, 0, about five or more inches wide, between the parts, placed about one inch (more or less) below the upper end of all the inner ends of the sheets except the top one, in order to form a recess to receive and answer as a rest for the edge of the lead lining-sheets D D, with sufficient space between the upper end and the lower end of the lead sheets D D, except the top end of the top sheet, as shown in the drawings, as will admit of being filled with melted lead, burned to each sheet securely, or may be filled with melted solder, E, wiped, burned, or otherwise applied over the joints of the lap, to render it more secure at that particular point.

F is the bottom of the digester, which is made similar in form to that used in my former patents, and secured to the lower end'of the digester A by means of bolts through a strong metal flange, G, on the lower end of the shell.

H is the lead lining of the bottom, which is made slightly larger, to admit of being turned up about one inch (more or less) around the edge, to form a recess between it and the lead sheet of the shell of the digester for the end of the side-lining l to pass down behind it, with a space between it and the turned-up edge of the bottom-lining H to be filled with melted lead and burned to the two sheets to unite them securely, or may be filled with solder, with an additional amount of solder, J, added in the same manner over the edges of the lap to render it more secure.

Kis an anchor-bolt for holding the lining to the shell of the digester, and L is the plate or flange on the inside, which is made in any suitable form, and when the bolt is inserted the plate is not screwed entirely down, but a L and lead lining D around the bolt are prevlously tinned before making the joint, thereby forming a perfect steam-tight joint.

0 O are the upper ring-flanges of the digester, which are made as shown in Fig. 2 of the drawings.

P is the bolt, and R is a lead bush around 1t, to prevent the acid liquor from leaking through to the bolts and thereby destroying them. This bush is formed by having the holes made larger than the bolts, and by inserting a mandrel of the same size in the center. Lead is poured around it, forming the bush, after which the bolt is inserted and the gut screwed down firmly upon the ends of the ush.

Therefore, what I claim as my invention, and deslre to secure by Letters Patent, in paper-pulp digesters, is-

1. In a digester, the combination of two 20 overlapping adjacent sections, B, the ring 0, secured between the sections and forming a rectangular recess between them inside the digester and the linings D, and soft-metal joint E, engaging with said recess, substantially as and for the purpose set forth.

2. In a digester, the combination of the lower section, B, the bottom secured thereto, the lining I, resting on the bottom, the bottomlining H, having its upper edge turned up past the end of lining I and soldered to it, and the strengthening-bandofsoftmetal,J,wiped about the said joint, substantially as and for the purpose set forth. 1 CHARLES BREMA KER.

WVitnesses:

GEORGE HAMMER, FRANK PARDOU. 

